Avg stuck in updating mode
Software Update requires a secure connection so, if you are also receiving errors on webmail login pages, bank sites or other secure (https) sites (e.g.https://addons.mozilla.org) see Error loading secure sites. If Software Update errors persist, you can download the latest version of Firefox or Thunderbird from install it "on top of" your current version, instead of using the Software Update feature.Only the setting from the file (or all-thunderbird.js) in the installation directory is used.This is so the application always uses the same updates regardless of what user profile you are running with.The Software Update feature allows you to automatically update your Mozilla application and installed add-ons (extensions and themes, but not plugins).Software Update is available in Firefox, Thunderbird, and Sea Monkey 2.If the issue is still not resolved and you are using Windows Vista, try the following:  Another possible solution is to reset the Software Update feature by ending all Firefox processes and then removing "active-update.xml", "updates.xml" and the "updates" folder from the appropriate folder locations (see above).As a last resort, download the latest version of Firefox from install it over your current version.
If the value in about:config has still not changed, then right click and reset the preference - this removes the profile value that is masking the application one. This is no longer the case and in fact now that preference is almost ignored.The message, AUS: Update XML File Malformed (200) can sometimes appear during a check for updates.This is a "catch-all" update error which can occur for different reasons such as being in "offline" mode, network problems, or not being signed on with your Master password (if you've set one up) before the update check .This article describes how to configure and run Software Update and discusses problems that can occur during or after an update.When an update is found, follow the on-screen instructions to download and install the update.
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Please contract your network provider and seek help, has been reported to Mozilla in bug 653830 (under investigation at time of writing). If you see a Software Update Failed error with the message, One or more files could not be updated.